TiO_2纳米颗粒对水泥-粉煤灰体系水化硬化及氯离子侵蚀的影响  

Influence of TiO_2 Nanoparticles on Hydration and Chloride Erosion of Cement-fly Ash System

作　　者：李海南 马保国[2] 谭洪波[2] 梅军鹏[2] LI Hainan;MA Baoguo;TAN Hongbo;MEI Junpeng(Accounting College,Wuhan Textile University,Wuhan 430200;State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430070)

机构地区：[1]武汉纺织大学会计学院,武汉430200 [2]武汉理工大学硅酸盐建筑材料国家重点实验室,武汉430070

出　　处：《材料导报》2019年第4期630-633,649,共5页Materials Reports

基　　金：硅酸盐建筑材料国家重点实验室(武汉理工大学)开放基金(SYSJJ2018-14);国家"十三五"科技支撑计划(2016YFC0701003-5)~~

摘　　要：利用微量热分析、X射线衍射(XRD)、差热分析(DSC)、扫描电子显微镜(SEM)、压汞测孔仪(MIP)等手段研究了TiO_2纳米颗粒对水泥粉煤灰体系水化硬化以及抗氯离子侵蚀的影响。研究发现:TiO_2纳米颗粒的异相晶核效应和微集料填充效应协同作用,促进了水泥熟料的水化,加快了粉煤灰的二次水化进程并降低了硬化水泥石的孔体积,使水泥粉煤灰材料的微观结构更加均匀密实,提高了水泥粉煤灰材料的力学性能和抗氯离子侵蚀性能。Micro-thermal analysis,X-ray diffraction (XRD),differential scanning calorimetry (DSC),scanning electron microscopy (SEM),and mercury intrusion porosimetry (MIP) were employed in the present work to study the hydration-hardening performance and the chloride erosion resistance of cement-fly ash system containing TiO 2 nanoparticles.Results showed that the synergic action of heterogeneous nucleation effect and micro-aggregate filling effect of TiO 2 particles promotes the hydration of cement,accelerates the secondary hydration of fly ash and causes pore volume decrease of the matrix.In consequence,the hardened pastes become more homogeneous and compact,resulting in an improvement in mechanical properties and chloride erosion resistance.

关 键 词：TIO2纳米颗粒 粉煤灰 水泥 水化 氯离子侵蚀 

分 类 号：TQ172[化学工程—水泥工业]